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**My book can't stick to one formula EVER.**

In Q7 They start off using: E = −ΔV Δs (equation 20-4)

Then magically go to: ΔV = EΔs

Where is the negative sign because it never states to find the magnitude of the potential difference

http://img198.imageshack.us/img198/6914/msbn.jpg [Broken]

In Q7 They start off using: E = −ΔV Δs (equation 20-4)

Then magically go to: ΔV = EΔs

Where is the negative sign because it never states to find the magnitude of the potential difference

http://img198.imageshack.us/img198/6914/msbn.jpg [Broken]

**I don't see how ΔV is directionless because in problem 3 it takes on the negative sign**

http://img90.imageshack.us/img90/6047/pa9.gif [Broken]

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